19 VERTICAL POSITION Recommended weaving patterns and torch positions for vertical up and vertical down are shown in Figure 7- 17. With vertical up, for a square edge preparation an in-line, back-and-forth weave is used. For a bevelled, multipass joint a ”U” pattern is used for the root. The fill and cover passes are made using a side-to-side weave with a backstep at the walls. The length of the backstep is on the order of a wire diameter. For a vertical up fillet a ”Christmas Tree” pattern is used with pauses at the side walls. For vertical down an inverted ”U” pattern is used, pausing at the side walls for the root, fill, and cover passes. Always take care in vertical down welding to keep the arc on the leading edge of the puddle. Preventing the molten metal from running ahead of the arc will improve weld soundness. Continued on next page...
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